A. Sieber, D. Foguet-Albiol, O. Waldmann, S. T. Ochsenbein, G. Carver, H. Mutka, F. Fernandez-Alonso, M. Mezouar, H. P. Weber, G. Christou and H. U. Güdel
Pressure dependence of the exchange interaction in the dimeric single-molecule magnet [Mn₄O₃Cl₄(O₂CEt)₃(py)₃]₂ from inelastic neutron scattering
Phys. Rev. B 74, 024405/1-4 (2006)                 

Abstract: The low-lying magnetic excitations in the dimers of single-molecule magnets [Mn₄O₃Cl₄(O₂CEt)₃(py)₃]₂, or (Mn₄)₂, are studied by inelastic neutron scattering as a function of hydrostatic pressure. The anisotropy parameters D and B, which describe each Mn₄ subunit, are essentially pressure independent, while the antiferromagnetic exchange coupling J between the two Mn₄ subunits strongly depends on pressure, with an increase of 42% at 17  kbar. Additional pressure-dependent powder x-ray measurements allow a structural interpretation of the findings.